Adsorption phase synthesis: preparation of nanoparticles and the effects of reactant distribution

Four reaction systems were employed to investigate the distribution of different reactants and its effects on the formation of particles by adsorption phase synthesis. Reactants such as Zn(2+), Cu(2+) and NaOH had different adsorption features on SiO(2) due to their various combinations with the SiO(2) surface. When the reactants were enriched on the silica surface, particles with size of several nanometers could be producted homogeneously on the SiO(2) surface. In the preparation experiments of water concentration dependence and temperature dependence, the increasing concentration of adsorbed reactant was in favor of the formation of smaller particles although there was interference from other factors, such as thickness of the adsorption layer and the reaction kinetics.